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How to Drink Champagne
Champagne stemware refers to the flute and coupe stemware used in the enjoyment of champagne, other sparkling wines, and certain beers. Champagne may also be served in a white wine glass with a tulip shape. The champagne flûte (fr. Flûte à Champagne) is a stem glass with a tall, narrow bowl. 
The bowl of a flute may resemble a narrow wine glass as seen in the illustration; or a trumpet shape; or be very narrow and straight-sided.
As with other stemware, the stem allows the drinker to hold the glass without affecting the temperature of the drink. The bowl is designed to retain champagne's signature carbonation, by reducing the surface area at the opening of the bowl. The flute has largely replaced the champagne coupe or saucer, the shape of which allowed carbonation to dissipate even more rapidly than from a standard wine glass. Its smaller diameter also allows more flutes to be carried on a tray.
Nucleation in a champagne glass helps form the bubbles seen in champagne. Too much nucleation will cause the carbonation to quickly fizzle out. A smoother surface area will produce fewer bubbles in the glass, and more bubble texture in the taster's mouth.
While most commonly used for sparkling wines, flutes are also used for certain beers, especially Belgian lambic and gueuze, which are brewed with wild yeast and often fruited. The tart flavor of these beers, coupled .jpg)
with their carbonation, makes them similar to sparkling white wines, and the champagne flute an ideal choice of glassware
The coupe was popularized in post-Prohibition America at the Stork Club [1], where Champagne flowed freely and celebrities had bottles of champagne sent to their tables, compliments of the house. The coupe was the champagne glass of choice through the 1960s.
The coupe, for many years overshadowed by the flute, has returned to fashion due to its use in the 1960s-based AMC series, Mad Men, known for its cultural authenticity.
White wine tulip glass
Champagne is a white wine, and can be served in white wine glasses. Some oenophiles prefer this, particularly in a "tulip" or "belly" shape in which the rim of the glass is narrower than the midpoint, as it permits the drinker to get more of the aroma than a traditional flute, while still not having enough surface area to cause the champagne to quickly lose carbonation.[1]
A flute must also be tipped at a severe angle in order to drink the bottom half of its contents, a problem which the tulip glass does not have.